Straightening Regulation Optimization on the Residual Stress Induced by the Compound Roll Straightening in the Heavy Rail

Song, Hua; Wang, Peilong; Fu, Li-Hua; Chen, Ming; Wang, Zhongqiang; Sun, Hongyu

doi:10.1155/2011/845025

Cited by 8 publications

(7 citation statements)

References 3 publications

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“…For a given distance between the rollers, there are many sets of setting values which result in a straight rail. With appropriately optimized settings, it is possible to reduce the level of residual stresses in the rails, which has been confirmed both by numerical simulations and tests in industrial conditions [10][11][12][13][14][15][16][17][18]. literature analysis did not reveal any publications devoted to the research on changing the pass design of straightener rolls to the residual stress level.…”

Section: Introductionmentioning

confidence: 84%

Archives of Metallurgy and Materials

2022

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Controlling the State of reSidual StreSSeS in railway railS by Modifying PaSS deSign of Straightening rollerSThe paper presents a summary of research on the possibility of influencing the state of residual stresses in railway rails by changing the pass design of vertical and horizontal straightener rollers and optimising their distribution on the rail perimeter. The presented results are devoted to the influence of profiled rollers on the level of residual stresses. a wide range of theoretical considerations were carried out based on the use of the finite element method using the commercial Forge software package. in order to verify the results of the theoretical considerations most reliably, a series of "in situ" experiments were conducted in industrial conditions on an existing production line. The tests were carried out on 120 meters long 60E1 railway rails. a significant reduction in the level of residual stresses compared to the standard requirements was achieved.

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Section: Introductionmentioning

confidence: 84%

Archives of Metallurgy and Materials

2022

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“…in the work [7] it was demonstrated that one of the reasons for the appearance damage and cracks in railway rails accelerating development of typical rail head defects are residual stresses. in turn, in paper [8] adopts explicit dynamics FEM to study on residual stresses where the optimal regulation was obtained, in which the residual stresses are the smallest. The study [9] was also devoted to clarify the residual stress distribution by simulation with a fully three-dimensional model taking into account both the bending and contact process.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

2022

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The article presents the results of the last stage of work on the impact of changes in the roll pass design on the state of residual stresses in railway rails. The discussed stage includes the summary of industrial experiments of rolling 60E1 rails with a length of 120 meters using a modified pass design of roll grooves. The rolling technology has been deeply modified, ranging from the finishing stand, through the pre-finishing stand, to the semi-finishing stand. The rails in this experiment were cooled using standard cooling technology and then straightened using innovative vertical straightener shaped rollers. Residual stresses were tested using the strain gauge method and the hole-drilling strain gauge method by drilling a hole in the rail axis and at a distance of 14 millimetres from its axis. The resulting tensile stresses in the rail foot were reduced to an average level of less than 43% in relation to the requirements of the En13674-1 standard.

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“…Biempica et al 6 reduced the residual stress by improving finite element model with contact conditions between the rails, the rollers, and the kinematic hardening material model. Finite element and orthogonal calculation 7 can also reduce the residual stress of straightened rails. Pernı´a et al 8 combined finite element method and genetic algorithm to determine the best roller position to ensure the minimum residual stress following roller straightening.…”

Section: Introductionmentioning

confidence: 99%

Three-point bending straightening algorithm and verification for I-type seamless welded rail

Mao

Lan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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The straightness of seamless welded rail (SWR) is very important for high speed railways. To improve the straightness of SWR, in this paper, we propose a three-point bending straightening algorithm for I-type SWR. It has been verified by theoretical analysis, finite element simulation, and experiments. The three-point bending straightening algorithm for I-type SWR has three steps: (1) three-point bending straightening prediction models are established based on simplified cross-section; (2) shape compensation coefficients are proposed to reduce the influence of simplified cross-section on the accuracy of the prediction models; (3) effective simplified cross-section dimensions are determined by optimizing shape coefficients with the Trust-Region-Reflective Least Squares method. The three-point bending straightening algorithm, which meets the needs of prediction precision in the industrial application, is stable and convergent, and could be the basis of further intelligent straightening.

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Straightening Regulation Optimization on the Residual Stress Induced by the Compound Roll Straightening in the Heavy Rail

Cited by 8 publications

References 3 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Three-point bending straightening algorithm and verification for I-type seamless welded rail

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